Summary of the invention
The invention provides polymer blend, it comprises the alkoxysilane-terminated polymkeric substance (A) of (1) end group that has formula:
-A-CH
2-SiR
1 a(OR
2)
3-a (1)
And if desired, also comprise with the polymer blend being the tin catalyst that the tin content of benchmark is no more than 100ppm, wherein
A be selected from-O-,-S-,-(R
3) N-, O-CO-N (R
3)-,-N (R
3)-CO-O-,-N (R
3)-CO-NH-,-NH-CO-N (R
3)-and-N (R
3)-CO-N (R
3)-divalent linker,
R
1Be alkyl, cycloalkyl, thiazolinyl or the aryl that optional halogen replaces with 1 to 10 carbon atom,
R
2Be to have the alkyl of 1 to 6 carbon atom or have the ω of 2 to 10 carbon atoms-oxyalkyl alkyl altogether,
R
3Be ring-type, the straight or branched type C that hydrogen, optional halogen replace
1To C
18Alkyl or alkenyl or C
6To C
18Aryl, and
A is 0 to 2 integer,
But the Silante terminated foaming mixtures that comprises isocyanate-free, alkoxysilane-terminated prepolymer with general formula (2) is not subject to the limits,
-X-CO-Y-CH
2-SiR
α w(OR
β)
3-w (2)
Wherein
X and Y be Sauerstoffatom ,-N-R
γBase or sulphur atom,
R
αBe alkyl, thiazolinyl or aryl with 1 to 10 carbon atom,
R
βBe to have the alkyl of 1 to 2 carbon atom or have the ω of 2 to 10 carbon atoms-oxyalkyl alkyl altogether,
R
γBe hydrogen atom, alkyl, cycloalkyl, have the thiazolinyl of 1 to 10 carbon atom or aryl or-CH
2-SiR
α w(OR
β)
3-w, and
The value 0 or 1 of w,
Condition is that in X and two bases of Y at least one is NH functional group, and
Propelling agent.
The feature of polymkeric substance (A) is that it contains alkoxysilane group, only separates by the methyl spacer electronegativity heteroatoms right with having at least one unbound electron.This makes these polymkeric substance have high reactivity for moisture, make them can be processed as polymer blend, even have a small amount of tin catalyst or even do not have under the tin catalyst, preferably under Wuxi or titanium catalyst, more preferably do not having fully under the heavy metal catalyst, this polymer blend at room temperature solidifies time or the sufficiently high solidification rate with enough weak points.
R
1Base is preferably methyl, ethyl or phenyl.R
2Base is preferably methyl or ethyl, and R
3Base is preferably hydrogen, has alkyl, cyclohexyl and the phenyl of 1 to 4 carbon atom.
The crosslinkable alcoxyl silylation of the preferred especially end capped polymkeric substance of alkoxysilane group (A) basicly separates as carbamate or urea groups with being connected at interval by methyl, and promptly polymkeric substance (A) is corresponding to general formula (1), and wherein A is selected from group-O-CO-N (R
3)-,-N (R
3)-CO-O-,-N (R
3)-CO-NH-,-NH-CO-N (R
3)-and-N (R
3)-CO-N (R
3)-.
If the A in the alkoxysilane-terminated polymkeric substance (A) is-O-CO-N (R
3), then the viscosity of these polymkeric substance is low especially.This is particularly advantageous for many application, especially at R
3Under the situation for hydrogen.
The main chain of alkoxysilane-terminated polymkeric substance (A) can be side chain or non-side chain.According to desired characteristics, in crosslinking mixture and in cured compositions, the two mean chain length can be adjusted arbitrarily.They can be synthetic by different structural units.Usually these are polysiloxane, polysiloxane-urea/urethane copolymers, polyurethane(s), polyureas, polyethers, polyester, polyacrylic ester and polymethacrylate, polycarbonate, polystyrene, polymeric amide, polyvinyl ester or polyolefine such as polyethylene, polyhutadiene, ethylene-olefin copolymer or styrene-butadiene copolymer.Also can use required polymeric blends with different main chains or composition.
Have the polymkeric substance (A) of the silane end group of general formula (1) for preparation, many possibilities are known, particularly including:
Unsaturated monomer copolymerization with general formula (1) group.This kind is monomeric may example to be (methyl) acryl oxygen methyltrimethoxy silane, (methyl) acryl oxygen methyl dimethoxy silane or other corresponding Ethoxysilane based compounds.
The poly-addition of epoxy derivative in the presence of epoxide-functional monomer with general formula (1) group.This type of is monomeric may example to be Racemic glycidol oxygen methyltrimethoxy silane, Racemic glycidol oxygen methyl dimethoxy silane or corresponding Ethoxysilane based compound.Silane monomer also can be grafted on the end capped prepolymer of suitable OH.
Grafting has the unsaturated monomer of general formula (1) group to thermoplastics such as polyethylene.This type of is monomeric may example to be (methyl) acryl oxygen methyltrimethoxy silane, (methyl) acryl oxygen methyl dimethoxy silane or corresponding Ethoxysilane based compound.
Prepolymer (A1) reacts with the organosilane (A2) of one or more general formulas (3),
C-B-CH
2-SiR
1 A(OR
2)
3-a (3)
Wherein, R
1, R
2, R3 and a definition as above.
B is oxygen, nitrogen or sulphur atom, and
C-B-is the functional group with the suitable functional group reactions of prepolymer (A1).
If prepolymer (A1) itself is made up of two or more structural units (A11, A12 etc.), not absolute demand these structural units (A11, A12 etc.) preparations prepolymer (A1) at first forms final polymkeric substance (A) with silane (A2) reaction more so.Therefore also can reverse reactions steps, at first make silane (A2) and one or more structural units (A11, A12 etc.) reaction, gained compound and remaining structural unit (A11, A12 etc.) are reacted, form final polymkeric substance (A).
The example of the prepolymer of being made up of structural unit (A11, A12 etc.) (A1) is OH-, NH-or end capped polyurethane(s) of NCO-and polyureas, and it can be by polymeric polyisocyanate (structural unit A11) and polyvalent alcohol (structural unit A12) preparation.
In the optimal way of a preparation polymkeric substance (A), the preferred silane that uses is selected from the silane (A2) of following general formula (4) and (5):
Z-CH
2-SiR
1 a(OR
2)
3-a (4)
OCN-CH
2-SiR
1 a(OR
2)
3-a (5)
Wherein,
Z is OH, SH or NHR
3Group, and
R
1, R
2, R
3And a definition as above.
When using the silane of general formula (4), its preferably with the end capped prepolymer of NCO-(A1) or this prepolymer contain NCO-precursor (A11) reaction.The latter can further react and form final polymkeric substance (A).
When using the silane of general formula (5), its preferably with the prepolymer (A1) of isocyanate reaction, promptly have OH, SH or a NHR
3The prepolymer of functional group (A1) reaction, or corresponding end capped precursor with this prepolymer (A11) reaction.The latter can further react then and form final polymkeric substance (A).The preferred silane that uses general formula (5) is because the viscosity of the end capped polymkeric substance of alcoxyl silylation (A) of gained is low especially, particularly when use has the prepolymer (A1) of OH functional group.
Except the silane (A2) of general formula (4) and (5), the structural unit (A11, A12 etc.) of preferred preparation polymkeric substance (A) also comprises the end capped polyvalent alcohol of the OH-with at least 2 OH/NH functional groups, monomeric polyol/amine and/or hydroxyalkyl or the end capped polydiorganosiloxane of aminoalkyl, and also comprises vulcabond or polyisocyanates.
In the process of preparation polymkeric substance (A), the whole isocyanate group that the total overall reaction step relates to and the concentration of whole isocyanate reaction bases and reaction conditions should suitably be selected so that polymkeric substance synthetic in all isocyanic ester by reaction consumes.So preferred isocyanate-free of final polymkeric substance (A).
The examples of polyhydric alcohols of preparation polymkeric substance (A) is aromatic series and the aliphatic pure and mild polyether glycol of polyester polyols as widely describing in the document particularly.But, can use whole polymerizations, oligomeric or even have a monomeric polyol of 2 or a plurality of OH functional group in principle.
The preferred compound that uses following general formula (6) is as hydroxyalkyl or the end capped polysiloxane of aminoalkyl:
Z-R
6-[Si(R
5)
2-O-]
n-Si(R
5)
2-R
6-Z (6)
Wherein
R
5Be alkyl with 1 to 12 carbon atom, preferable methyl.
R
6Be side chain or non-side chain hydrocarbon chain with 1 to 12 carbon atom, preferred trimethylene, and
N is 1 to 3000 number, and is preferred 10 to 1000, and
The definition of z such as above-mentioned.
Usually the example of vulcabond is vulcabond ditan (MDI), it can be the form and pure 4 of thick MDI or technical grade MDI, 4 ' and/or 2,4 ' isomer or the form of its mixture, or the tolylene diisocyanate of various isomers forms (TDI), naphthalene diisocyanate (NDI), isophorone diisocyanate (IPDI) or other 1,6 hexylidene diisocyanate (HDI).The example of polymeric polyisocyanate is polymeric MDI (P-MDI), triphenylmethane triisocyanate or the two urine triisocyanates that contract.
Even at room temperature, the polymkeric substance in the polymer blend of the present invention (A) also fully reacts for moisture, and it is solidified with high speed.Use wherein that R2 is the end capped polymkeric substance of the methoxy silane of methyl (A), even the Wuxi architectural feature, tack-free time is less than 1 minute and also belongs to may.
Polymer blend of the present invention does not preferably have tin catalyst, particularly organo-tin compound, and no titanium catalyst is preferred equally.Preferred especially polymer blend of the present invention does not have any heavy metal catalyst.Herein, so-called catalyzer, being meant can catalysis polymer blend solidified compound.Organic heavy metal compound particularly.So-called herein heavy metal is meant that light metal is the whole metals beyond basic metal, alkaline-earth metal and aluminium and the scandium.Inactive and toxicology of catalysis and environmentally acceptable titanium dioxide can be added in these preferred polymer blends as filler, dyestuff.
In polymer blend, also can use organic amino compounds as base catalyst.Example is aminopropyl trimethoxysilane, aminomethyl dimethoxy silane, aminomethyl-methyl dimethoxysilane, N-(2-aminoethyl)-aminopropyl trimethoxysilane, N-(2-aminoethyl)-aminopropyl trimethoxysilane, triethylamine, Tributylamine, 1,4-diaza-bicyclo [2.2.2] octane, N, two (the N of N-, N-dimethyl-2-aminoethyl) methylamine, N, N-dimethyl ester hexahydroaniline, N, accelerine, N-ethylmorpholine etc.Preferred used these catalyst concentration are 0.01 to 10 weight %.Various catalyzer can be pure form or use with the form of different catalysts mixture.Preferred catalyzer is the compound of general formula (7):
Z-R
4-SiR
1 a(OR
2)
3-a (7)
Wherein,
Z is NHR
3Base,
R
4Be optional by with oxygen or N (R
3) base side chain with 1 to 10 carbon atom or non-branched hydrocarbyl at interval, and
R
1, R
2, R
3With a definition as above-mentioned.
If R
4Be preferably CH
2Base, then general formula (7) is corresponding to general formula (4).
In the actual building-up process of polymkeric substance, if necessary, described catalyzer can all or only partly add.
If in the process of preparation polymkeric substance (A), (wherein Z is defined as NHR to one or more compounds of general formula (4)
3) as organosilane (A2), the catalytic activity amount that still exists in final polymer blend of the present invention of these silane is 0.01 to 10 weight % so, it can be equally as curing catalysts.Use tin catalyst in the polymer blend that contains alkoxysilane-terminated polymkeric substance (A), even minute quantity, tin content is no more than 100ppm, preferably is no more than 50ppm, and more preferably no more than 10ppm, oneself is enough.
Particularly advantageously be, but though the polymer blend of the present invention for preparing contains non-reacted fully relatively ethoxy silylation terminated polymer (A), wherein, R
2Be ethyl, but it has reactivity to moisture,, also solidify with enough two-forties even make not have under the situation of tin catalyst.So even use Ethoxysilane terminated polymer (A), the Wuxi system with tack-free time below 10 minutes also may.Polymer blend of the present invention contains Ethoxysilane terminated polymer (A), and its advantage is during curing, and solidifying the product elimination product that discharges only is ethanol.This represents the preferred embodiments of the invention.
This neoteric polymer blend can comprise the conventional adjuvants as other components, such as crosslinked single-component compositions of conventional alkoxyl group such as filler, water scavenging agent, reactive thinner, adhesion promotor, softening agent, thixotropic agent, photostabilizer, sterilant, fireproofing agent, dyestuffs.For making non-crosslinked polymer blend and cured compositions produce special desired characteristics, inevitably carry out this type of interpolation usually.
Polymer blend of the present invention has countless different purposes aspect tackiness agent that is used for topcoating and manufacturing moulded product and the sealing agent (comprising joint sealant).
It is suitable for various substrate, such as mineral substrate, metal, plastics, glass, stupalith etc.
Polymer blend of the present invention can pure form or use with the form of solution or dispersion liquid.
In each case, all symbols in the above-mentioned general formula all have definition independent of each other.In all general formulas, Siliciumatom is a tetravalence.
Following embodiment, unrestricted the present invention in order to explanation.Unless otherwise prescribed, all amount and per-cents are weight ratio, and all pressure is 0.10MPa (definitely), and all temperature are 20 ℃.
Being used for weighing the non-polymer blend of the present invention of polymer blend of the present invention or comparative example reactive all is tack-free time.Tack-free time was more suitable for than the used time before solidifying by volume fully herein, because the latter is not only depended on the reactivity of polymer blend of the present invention, and depended on the steam breathability of consolidated layer wholly or in part.In addition, tack-free time can be measured very exactly.Tack-free time was meant in air behind the using polymer up to the surface cure of the polymkeric substance time to following degree: when contacting with scraper with experiment, this surface is mucoadhesive polymers on scraper not both, the haircuts phenomenon also do not occur.
Embodiment
Embodiment 1
The preparation of isocyanatomethyl Trimethoxy silane
By currently known methods (US 3 494,951), initial by the chloromethyl Trimethoxy silane, synthesizing amino methyl-formiate base Trimethoxy silane.
Argon gas is poured in the quartzy thermal decomposition tube of filling silica wool.Temperature is between 420 to 470 ℃ in the quartzy thermal decomposition tube.At the end of heating unit, concentrate and collect thick product by condenser.The distillation purifying of colourless liquid is carried out in decompression.Under 89 to 90 ℃ (82mbr/ millibars), surpass 99% in the purity of the product that the top produced, but unreacted carbamate can separate again in the bottom.It can provide again and be directly used in pyrolysis.
In this way, from 56.9 the gram (273mmol) methylene dicarbamate base Trimethoxy silane initial, obtain 33.9 the gram (191mmol) hope product isocyanatomethyl Trimethoxy silane, its purity is greater than 97%.This correspondence and 70% of theoretical yield.
Use similar approach to prepare other described silane: isocyanatomethyl methyl dimethoxysilane, isocyanatomethyl triethoxyl silane and isocyanatomethyl methyldiethoxysilane.
Embodiment 2
The preparation of N-phenylamino methyl trimethoxy oxosilane
The silane of all 537 grams (5.77mol) is put into the laboratory reaction device, carry out inerting with nitrogen then and handle.Be heated to 115 ℃ temperature, the 328 chloromethyl Trimethoxy silanes that restrain (1.92mol) were splashed into above 1.5 hours, continue down to stir 30 minutes at 125 to 130 ℃ then.After adding about 150 these silane of gram, can engender the hydrochlorinate aniline precipitation of salt form, still, must continue stirring and be metered into up to finishing.
Good vacuum (62 ℃/7mbar) under, remove excessive aniline (about 180 grams).Then, under about 50 ℃, add the toluene of 350ml, and under 10 ℃, continue stirred suspension, to finish the crystallization of hydrochlorinate aniline.The latter filters subsequently.Under 60-70 ℃ of partial vacuum, remove solvent toluene.Residuum by distillation come purifying (89 to 91 ℃/0.16mbar).
Reach the products of 331.2 grams, promptly 75.9% of theoretical value, product purity is about 96.5%.Use identical method to prepare N-phenylamino Union carbide A-162.
Embodiment 3
With 30 gram (70.6mmol) average molar mass is that the straight chain polypropylene glycol of 425g/mol adds in the container, and about 1 hour of 100 ℃ of following decompression dehydrations.Glycol miscellany with dehydration is cooled to about 500 ℃ subsequently, and under this temperature, with the toluene-4,4 of 24.6 grams (141.2mmol) '-vulcabond (TDI) adds under nitrogen, adds speed and be no more than 90 ℃ for making its temperature rising.After add finishing, with mixture 90 ℃ of stir abouts 15 minutes.Be cooled to about 50 ℃, splash into the N-phenylamino methyltrimethoxy silane of 33.7 grams (148.3mmol) then.Under 60 ℃, stirred this miscellany 60 minutes then, till using infrared spectra to detect less than the isocyanate functional group.Obtain limpid, transparent polymkeric substance, the viscosity under 20 ℃ is greater than 1000Pas, is 90Pas down at 50 ℃.
Need not add other curing catalysts again.After using this miscellany, aerial tack-free time be about 2 minutes (standard conditions: 23 ℃, 50%rh).
Embodiment 4
With 28.6 gram (110mmol) average molar mass is that side chain polypropylene glycol and the 8.1 gram average molar mass of 260g/mol are that the polypropylene glycol of 1500g/mol is put into container, and 100 ℃ of following decompression dehydrations 1 hour.The glycol miscellany of dehydration is cooled to about 50 ℃, and under this temperature, the toluene-2,4-diisocyanate (TDI) of 10.1 grams (57.7mmol) in nitrogen, occurs.This moment, temperature must not rise above 80 ℃.After adding end, it is about more than 15 minutes to stir this mixture in this temperature.In 50 ℃ nitrogen atmosphere, splash into 44.3 gram (250mmol) isocyanatomethyl Trimethoxy silanes so far in the mixture, during temperature should be below 60 ℃.Under 80 ℃, stirred this miscellany 60 minutes then, till using infrared spectrum to detect less than isocyanate group.Obtain clear, transparent polymkeric substance, viscosity is 17Pas down at 50 ℃.
Resulting polymers mixes as the aminopropyl trimethoxysilane of catalyzer with 2 grams.With with using in this miscellany, in air tack-free time be about 1.5 minutes (standard conditions: 23 ℃, 50%rh).
Embodiment 5
With 500 gram (33.3mmol) average molar mass is the α of 15000g/mol, and ω-hydroxypropyl polydimethylsiloxane is put into container, and 100 ℃ of decompression dehydrations 1 hour.After being cooled to 30-35 ℃, adding the isocyanatomethyl trimethoxy silane of 13.0 grams (73.3mmol), and continue to stir 30 minutes, till using infrared spectra to detect less than isocyanate group.To produce clear, transparent polymkeric substance, viscosity is 9.5Pas down at 20 ℃.
Need not add any curing catalysts again.After using this miscellany, (standard conditions: 23 ℃/50%rh) that aerial tack-free time is about 1 minute.
Embodiment 6
Under 25 ℃, in the planetary-type mixer of laboratory, the hydrophilic pyrolytic silicon dioxides that will restrain TMS end-blocking polydimethyl silane, 16.7 gram 3-(2-aminoethyl)-aminopropyl-Trimethoxy silanes, 16.7 gram vinyltrimethoxy silanes and 85 grams that viscosity are 100Pas according to the Silante terminated polydimethyl silane and 230 of embodiment 5 preparations mix, and this miscellany of processing becomes hard mashed prod in 0.5 hour.
Need not add any curing catalysts again.After using this miscellany, (standard conditions: 23 ℃/50%rh) that aerial tack-free time is about 7 minutes.
Embodiment 7
With 400 gram (50.0mmol) average molar mass is that the polypropylene glycol of 8000g/mol is put into container, and 100 ℃ of following decompression dehydrations 1 hour, then under 100 ℃, in the isophorone diisocyanate polymerization that surpasses in 60 minutes time with 6.3 grams (28mmol).Resulting OH end-blocking polyester-urethane prepolymer is cooled to 60 ℃ subsequently, and the isocyanatomethyl Trimethoxy silane with 9.9 grams (56mmol) mixes again, and continues to stir 60 minutes, detects less than till the isocyanate group in infrared spectra.To produce clear, transparent polymkeric substance, viscosity is 85Pas down at 20 ℃.
Need not add any curing catalysts again.After using this miscellany, (standard conditions: 23 ℃/50%rh) that aerial tack-free time is about 3.5 minutes.
Embodiment 8
Under 25 ℃, in the planetary-type mixer of laboratory, to restrain sedimentary and exsiccant chalk (prior drying according to Silante terminated polymkeric substance and the 155 phthalic acid two different undecyl esters that restrain, 3-(2-aminoethyl) aminopropyl trimethoxysilane of 21.0 grams, the vinyltrimethoxy silanes and 435 of 21 grams that example 7 prepares, water content is below 50ppm), and this miscellany becomes hard mashed prod.
Need not add any curing catalysts again.After using this miscellany, (standard conditions: 23 ℃/50%rh) that aerial tack-free time is about 15 minutes.
Embodiment 9
With 400 gram (50.0mmol) average molar mass is that the polypropylene glycol of 8000g/mol is put into container, and 100 ℃ of following decompression dehydrations 1 hour, then under 100 ℃, in the isophorone diisocyanate polymerization that surpasses in 60 minutes time with 6.3 grams (28mmol).Resulting OH end-blocking polyester-urethane prepolymer is cooled to 60 ℃ subsequently, and the isocyanatomethyl triethoxyl silane with 12.3 grams (56mmol) mixes again, and continues to stir 60 minutes, detects less than till the isocyanate group in infrared spectra.To produce clear, transparent polymkeric substance, viscosity is 80Pas down at 20 ℃.
Need not add any curing catalysts again.After using this miscellany, (standard conditions: 23 ℃/50%rh) that aerial tack-free time is about 6.5 minutes.
Embodiment 10
With 400 gram (50.0mmol) average molar mass is that the polypropylene glycol of 8000g/mol is put into container, and 100 ℃ of following decompression dehydrations 1 hour, then under 100 ℃, in the isophorone diisocyanate polymerization that surpasses in 60 minutes time with 6.3 grams (28mmol).Resulting OH end-blocking polyester-urethane prepolymer is cooled to 60 ℃ subsequently, and the isocyanatomethyl methyl dimethoxysilane with 9.0g (56mmol) mixes again, and stirs 60 minutes, detects less than till the isocyanate group in infrared spectra.To produce clear, transparent polymkeric substance, viscosity is 77Pas down at 20 ℃.
Resulting 50 gram polymkeric substance mix with the phenylamino methyl trimethoxy oxosilane of 2 grams as catalyzer.After using this miscellany, aerial tack-free time be about 2.5 minutes (23 ℃/50%rh).
Embodiment 11
With 400 gram (50.0mmol) average molar mass is that the polypropylene glycol of 8000g/mol is put into container, and 100 ℃ of following decompression dehydrations 1 hour, then under 100 ℃, in the isophorone diisocyanate polymerization that surpasses in 60 minutes time with 6.3 grams (28mmol).Resulting OH end-blocking polyester-urethane prepolymer is cooled to 60 ℃ subsequently, mixes with the isocyanatomethyl methyldiethoxysilane of 10.6g (56mmol), and stirs 60 minutes, detects less than till the isocyanate group in infrared spectra.To produce clear, transparent polymkeric substance, viscosity is 85Pas down at 20 ℃.
Resulting 50 gram polymkeric substance mix with the phenylamino methyl trimethoxy oxosilane of 2 grams as catalyzer.After using this miscellany, aerial tack-free time be about 5.5 minutes (23 ℃/50%rh).
Comparative example 1
Repeat the step of embodiment 3.But, before in atmosphere, using, the dibutyl tin laurate of polymkeric substance miscellany and 0.3 gram.In air (23 ℃, 50%rh) use this polymkeric substance miscellany after, the tin catalyst that is added does not have the effect of any promotion skinning.Tack-free time is about 2 minutes.
Comparative example 2
Repeat the step of embodiment 3.But, use the N-phenyl-3-aminopropyl trimethoxysilane of 38.9 grams (148.3mol) to substitute N-phenyl-3-aminomethyl Trimethoxy silane.To produce clear, transparent polymkeric substance, detect less than isocyanate group in the infrared spectra.The viscosity of this polymkeric substance is 19Pas down at 50 ℃.
Do not add other curing catalysts, aerial tack-free time be a few hours (23 ℃, 50%rh).
Comparative example 3
Repeat the step of embodiment 5.But, use the propyl isocyanate base Trimethoxy silane of 15.8 grams (73.3mol) to substitute the isocyanatomethyl Trimethoxy silane.To produce clear, transparent polymkeric substance, detect less than isocyanate group in the infrared spectra.The viscosity of this polymkeric substance is 9.0Pas down at 20 ℃.
Do not add other curing catalysts, aerial tack-free time be a few hours (23 ℃, 50%rh).
Comparative example 4
The industrial parahelium propyl silane end-blocking polyurethane(s) esters of 50 grams (the Desmoseal LS 2237 that is buied by Bayez AG) are mixed as the phenylamino methyltrimethoxy silanes of catalyzer with 2 grams.After using this miscellany, its tack-free time be a few hours (23 ℃, 50%rh).